Mozilla Add-ons

Savannah

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SourceForge

In the Files section of each project there's a list of packages named Latest File Releases, each with a monitor button to the right. Press the button to start tracking a particular package. You'll get a mail for each new release, but you won't get any notification if a new package appears in the project. Some projects release new versions as separate packages, making this monitor feature useless. You must be logged in in order to be able to subscribe.